| Asset Drone Inspection Ltd | Scunthorpe | 2023 |
| Asset Finance and Management (Solutions) Limited | Aldershot | 2004 |
| Asset Leasing Limited | Hoddesdon | 2005 |
| Asset Lifecycle Management Limited | Hove | 2022 |
| Asset Management Associates (Europe) Limited | King'S Lynn | 2009 |
| Asset Manager Live Limited | Doncaster | 2011 |
| Asset Prime Investment Limited | Manchester | 2026 |
| Asset Recovery (North West) Ltd | Salford | 2012 |
| Asset Recovery London Ltd | Waltham Abbey | 2024 |
| Asset Release Limited | Swansea | 2012 |
| Asset Rentals Limited | Liverpool | 2013 |
| Asset Turnaround Limited | Doncaster | 2013 |
| Asset Verification Solutions Limited | Birmingham | 2024 |
| ASSETBAR1 Ltd | Waltham Cross | 2022 |
| Assetguard Legal Services Limited | Ilford | 2024 |
| Assets and Investments Remuneration Ltd | Rayleigh | 2011 |
| Assets Financial Services Limited | Reading | 1999 |
| Assets Management Sussek Ltd | London | 2025 |
| Assettagz Holdings Limited | Derby | 2026 |
| Assetview Limited | Nottingham | 2022 |
| Asshawes 1955 Limited | Chorley | 2013 |
| Assign One Limited | Pontefract | 2013 |
| Assington Metal and Waste Recycling Ltd | Limehouse | 2019 |
| Assist Air Limited | Bridgend | 2010 |
| Assist for Your Life Ltd | London | 2023 |
| Assistance for YOU Invest Limited | London | 2023 |
| Assistance for YOU Limited | London | 2023 |
| Assistans I Stockholm Investment Limited | London | 2022 |
| Assistans I Stockholm Limited | London | 2022 |
| Assistec Ltd | Bishopton | 2024 |
| Assisted Living (Anglesey) Ltd | Llannerch-Y-Medd | 2024 |
| Assistive Living Limited | | 2007 |
| Assm Limited | Sutton | 2024 |
| Assmar Ltd | London | 2024 |
| Assn Apparel Limited | London | 2020 |
| Associate Sales Ltd | Solihull | 2014 |
| Associated African Nickel Resources Limited | London | 2018 |
| Associated ASH Importers Limited | Brighton | 2004 |
| Associated Asphalt Civils Ltd | London | 2018 |
| Associated Asphalt Limited | Henley-On-Thames | 1997 |
| Associated British Caravans (Hire) Limited | Newmarket | 1967 |
| Associated British Caravans Limited | Newmarket | 1936 |
| Associated British Ports Investments Limited | London | 1986 |
| Associated Business Sevices Limited | London | 2014 |
| Associated Catholic NEWSPAPERS(1912)LIMITED(THE) | Liverpool | 1912 |
| Associated Electrical Engineering Services Limited | Coventry | 2004 |
| Associated Events and Exhibitions Limited | Glasgow | 1985 |
| Associated Funeral Services Limited | Sutton Coldfield | 1983 |
| Associated Properties Henley Limited | Henley-On-Thames | 1997 |
| Associated Property Investment Limited | Billingham | 2017 |
| Associated Protein Limited | Haverhill | 2024 |
| Associated Rediffusion Ltd | Keighley | 2023 |
| Associated Safe Systems Limited | Manchester | 2011 |
| Associated Security Services Limited | Manchester | 1989 |
| Associated Strategies Limited | St Ives | 2023 |
| Associated Supplies Limited | Buxton | 1994 |
| Association of Competent Person Schemes Limited | Mansfield | 2012 |
| Association of Energy Suppliers | London | 1997 |
| Association of European Art Exhibition Centre | London | 2021 |
| Association of Healthcare Trainers Ltd | New Romney | 2015 |
| Association of Independent Electricity Producers Limited | London | 1994 |
| Association of International Professionals | London | 2023 |
| Association of Investment Funds Limited | Greater London | 1995 |
| Association of Rover Clubs Limited | Redditch | 2001 |
| Association of Singer Car Owners | Bedford | 2018 |
| Association of Soft Furnishers Limited | London | 2006 |
| Association of the Petroleum Industry of Kurdistan | Leeds | 2023 |
| Assura CS Limited | Altrincham | 2010 |
| Assura Cvsk Limited | Altrincham | 2011 |
| Assura Tax Limited | Warrington | 2015 |
| Assure Fertility Limited | Whitefield | 2015 |
| Assure Property Buyers Ltd | Beaconsfield | 2023 |
| Assure SES Limited | Chepstow | 2019 |
| Assurebond Limited | Doncaster | 2009 |
| Assured Care Personnel Ltd | Canvey Island | 2017 |
| Assured Fire Solutions Limited | Halstead | 2009 |
| Assured Guardians Limited | Finchley | 2015 |
| Assured Medical Limited | Worsley | 2018 |
| Assured Process Servers Limited | Chorley | 2020 |
| Assured Risk Solutions (ARS) Limited | Hampshire | 2008 |
| Assured Safety Associates Ltd | Thornton Heath | 2024 |
| Assynia Limited | Newbury | 2001 |
| AST Innovations Limited | Nottingham | 2014 |
| AST Investments Limited | Uxbridge | 2021 |
| Asta Blue Line Services Ltd | London | 2017 |
| Asta Piante Ltd | Witney | 2007 |
| Astala Skincare Limited | Chester | 2020 |
| Astar Harvest Ltd | Kenilworth | 2018 |
| Astara Lashes Limited | Liverpool | 2020 |
| Astaxanthin Manufacturing Limited | London | 2003 |
| Astbury Meadow Garden Centre Limited | Carlisle | 1972 |
| Astec Venture Services Limited | Burton-On-Trent | 2005 |
| Astellar Solutions Limited | Ruislip | 2023 |
| Astello Software Solutions Ltd | Edinburgh | 2024 |
| Aster Academies Trust | Devizes | 2014 |
| Aster Education | Devizes | 2014 |
| Aster Publishing Ltd | London | 2017 |
| ASTERA1 Limited | Salford | 2025 |
| Asterbridge Limited | Harrow | 2016 |
| Astermill Limited | Manchester | 1976 |